// "::/96"
		Prefix:     netip.PrefixFrom(netip.AddrFrom16([16]byte{}), 96),
		Precedence: 1,
		Label:      3,
	},
	{
		// "2001::/32"
		// Teredo
		Prefix:     netip.PrefixFrom(netip.AddrFrom16([16]byte{0x20, 0x01}), 32),
		Precedence: 5,
		Label:      5,
	},
	{
		// "2002::/16"
		// 6to4
		Prefix:     netip.PrefixFrom(netip.AddrFrom16([16]byte{0x20, 0x02}), 16),
		Precedence: 30,
		Label:      2,
	},

		if err == nil {
			ip = netip.AddrFrom4(from.Addr)
			port = from.Port
		}
	case syscall.AF_INET6:
		var from syscall.SockaddrInet6
		n, err = c.fd.readFromInet6(b, &from)
		if err == nil {
			ip = netip.AddrFrom16(from.Addr).WithZone(zoneCache.name(int(from.ZoneId)))
			port = from.Port
		}
	}
	if err == nil {
		addr = netip.AddrPortFrom(ip, uint16(port))
	}
	return n, addr, err
}

	}
	var ret [16]byte
	for i, f := range fs {
		a, b, err := parseWord(f)
		if err != nil {
			return Addr{}, err
		}
		ret[i*2] = a
		ret[i*2+1] = b
	}

	return AddrFrom16(ret).WithZone(zone), nil
}

// normalizeIPv6Slow expands s, which is assumed to be an IPv6
// address, to its canonical text form.
//
// The canonical form of an IPv6 address is 8 colon-separated fields,